Maintenance plan don't stop & don't backup all databases I have a server with 100 databases,
I have a maintenance plan (MP) for backups.
I noticed that the maintenance plan don't backup all databases when I'm looking at the backup folder destination I can see that it stops after 50 databases +-.
The job is still in running mode - it doesn't stop.

So in one hand, I can see that there are no new backups files (after the first 50) and on the other, the job is not stopping.
If the job is still running, check what command it's currently executing with Adam Machanic's excellent free stored procedure, sp_WhoIsActive. After installing it (typically in the master database), you can run sp_WhoIsActive to list the running queries and see what command they're executing right now.

There's even a Percent Complete column that gets populated for backups and restores.

You might have a particularly large database (or log file) that's just in the midst of getting backed up.

For further followups &amp; clarification, try taking a picture or copy/pasting the sp_WhoIsActive results in, showing what the maintenance plan's currently doing.