Backup strategy for FCPX libraries

Hi, I've got a bunch of wd passport external drives with fcpx libraries on it. I want to backup the original fcpx libraries, but what is the best affordable strategy for about 1TB of data each year?

well I use www.greenworldsoft.com/sync-folders-pro-help.php works pretty well and checks as well which file needs to be copied or deleted so no need to copy a whole library in case only a few files have changed.
Otherwise have a look at www.arcticwhiteness.com/finalcutlibrarymanager/ but this one only copies the whole file / library.

Or Carbon Copy Cloner which we use. And a plain old USB 2.0 backup drive. Or keep it simple and use TimeMachine.

Or send from time to time some emails to Karsten Once I send him a motion file where I was working on for a couple of days and after a while it disappeared from my motion template folder (guess I deleted that by mistake) thanks good I found thatI in my mail outbox to Karsten )) ufffffff

Thanks. My backup strategy is to copy all footage into a larger disk. Used final cut pro library manager to do some housekeeping. Then separated the libraries to have one library file for each year. Upgraded some old imovie projects and then sent to final cut pro. It all works flawlessly, so I have time to finish my new project

Forgive me. does this mean that you keep only the back up versions, or the original libraries as well.
I have been downloading shot files to external hard drive, then creating the library .footage. project for that in the external hard drive as well to deal with these huge amounts of data.
when complete this can then be copied to another external hd so you have 2 copies of it.
it appears that you just have to buy the storage, and thank goodness it comes cheaper these days.

I copy the fcpx libraries to the new external disk. Within the library I keep the original media and project files. Then when the library is copied, I have two copies of it.

Indeed the best part is that the drives are cheaper these days

thanks to Wilfried for intel. on reflection perhaps this is a good workflow, if you can bear to dedicate a mac to a project.
1. download footage to external hd
2. review in cs6 or..??.and trash rejects to minimise space.
3. open library in mac, and import and work in and on the mac.
this means that a back up is created in time machine (which does not reference external hard drives as i understand it)
4 then when finished copy that library from mac to external hard drive, so you have two copies safe, one in time machine and one on the external hard drive. you can then trash the original footage to free up a bit of space.
any opinions valued. thanks

I only work with fcpx using libraries that resides on external disks. It's a best practice, and you do this for performance reasons. I just copy old libraries into another externals disk for backup.

You can also include the external drive (where your library file is located) into the time-machine backup. You do not need to copy the library to your local hard drive to create a backup.

Currently I'm working on the 2017 library. This library is also located on an external disk. I use time machine to include this drive into the backup, since this library changes a lot over time.

One thing I like about CCC (and others like it) are that "while I'm working" on a Library that I may be referencing for days, weeks, months, it does incremental backups. It only overwrites or adds file to the backup copy that have changed. This takes very little time each night. I also have control over what does and doesn't backup. I have lots of stuff on these drives that don't matter that much in the long run, so we exclude them from the backup. TimeMachine doesn't give you some of those options. Just FYI.

thank you for this valuable intel. so crucial for these primary steps to be correct.
I hear and obey. grasshopper