There is compression in the Enterprise tool cbbackupmgr (https://docs.couchbase.com/server/current/backup-restore/cbbackupmgr-backup.html) but , IIRC, it’s not included in the Community Edition which uses an older tool (note the cbbackup/cbrestore vs cbbackupmgr)
There’s also compression on the server-side in the Enterprise Edition.
Keep in mind that the Enterprise Edition is free to download and develop on so if you think you’d like to take advantage of some of those capabilities, you can do so now and then get a license when you’re ready to go into production.