Macbook - "other" storage and filling up

Please read See used and available storage space on your Mac - Apple Support. Pay particular attention to the description of System Data.

You may find neuroanatomist's User Tip helpful: What is "Other" storage on a Mac, and how can I clean it out? - Apple Community.

• What Apple used to label "Other" is now labeled "System Data".

A potential solution may be to back up that Mac with Time Machine, assuming you aren't already doing that. To learn how to use Time Machine please read Back up your files with Time Machine on Mac - Apple Support. You may find that subsequent to creating that backup, the "Other" space will have been reduced..

Hello -cdn-,

We understand that you have some concerns with your storage. Details about the storage and how to manage it can be found at Free up storage space on your Mac - Apple Support Some of that includes:

• Delete music, movies, podcasts, or other media, especially if it's media that you can stream or download again as needed.
• Delete files in your Downloads folder. Open this folder from the Dock, or by choosing Go > Downloads from the menu bar in the Finder.
• If you use the Mail app for your email, choose Mailbox > Erase Junk Mail from the menu bar in Mail. Also choose Mailbox > Erase Deleted Items.
• If you use your Mac to back up your iPhone or iPad, you can delete old backups.
• Uninstall apps that you no longer use.
• If your Mac is set up for multiple users, delete users that no longer need access to your Mac. Or ask them to follow the steps in this article after logging in to their user account. Also check the Users folder on Macintosh HD for any undeleted data belonging to deleted users. 
• Check the Users folder on Macintosh HD for any shared files that you no longer need to share.

If you don't want to delete certain files, you might be able to save space by compressing them. Then expand them when you need to use them again.

Did you empty the Trash? When you move a file to the Trash, its storage space doesn't become available until you empty the Trash.

Other storage contains things such as the operating system and temporary files and caches. It should be self managing - like you see when restarting - and clear space as necessary. Are you ever getting alerts about low storage?

Thanks!