Is there a way I could roll back two modules, I have deleted some fields from two modules, which I think has broken a custom field.
I haven’t done a backup in Admin on SuiteCRM, but there are backups of folders and files on the server.
Could I restore these modules by overwriting newer files/folders with the older ones in the backend?
Do you mean files under “custom” directory? That should be safe.
If you mean elsewhere, and you’re using files from a previous version of SuiteCRM, then it’s much riskier. Maybe you can try doing a “diff” on those files to see how much you’re changing, and whether there are other changes in the files (due to updated SuiteCRM code, unrelated to your changes).