3.0.1 cbbackup hangs/freezes on certain buckets

We are using CB 3.0.1 and are experiencing an issue where backups are freezing/hanging when performed.

/opt/couchbase/bin/cbbackup http://localhost:8091 ./couchbase -u <user> -p <password> -v

We have multiple buckets but when one of them, lets call it bucket1, the cli stops outputting any information and I have to kill the backup process with CTRL+C. Upon inspecting the directory, I can see that the bucket in question is missing. Upon searching for answers, I have seen that there was a bug in this release that made this backup consume a lot of resources, but we are talking about only a few thousand documents here, about 100MB in total. The machine itself has 16 GB RAM which is barely used so it should be enough.

Version 3.0.1 is extremely old, is it possible to upgrade to a more recent version as there have been an enormous amount of improvements over the years?