As noted many times 
…
Sync is ​not ​a backup, neither advertised nor advocated as such. We strongly advocate proper primary backups using TimeMachine (or similar snapshot-style backup applications) and external drives. Also, you should read the series of articles we posted: DEVONtechnologies | Search & Find
That being said, the next question is…
Mainly have it sync when I am on the go
Why?
There are two questions to consider…
- Do you have an assistant, colleague, family member, etc., that needs to have quick and frequent access to modifications in a database while you’re out and about?
- Are you using a shallow sync in DEVONthink To Go?
PS: There is a forum post discussing the options and considerations of the available sync methods: Sync Types Explained​
If you do need a remote option, CloudKit has not been very reliable for many people ​(including developers) ​for several months.​ You may want to consider an alternative.