I wouldn't.
Use a proper backup tool for this, like restic. BackBlaze has reasonable rates, especially of you're mostly write-only, and restic has built-in support for B2 and encrypts everything by default. It also supports compression, but you won't get much out of that on media files. restic is also cross-platform and a single executable, so you can throw binaries for OSX, Linux, and Windows on a USB stick and know you can get to your backups from anywhere. It also allows you to mount a remote repository like a filesystem (on Linux, at least), and browse a backup and get at individual files without having to restore everything. It's super handy if you screw up a single file or directory.