Other on About my Mac is taking up 205.32 GB of disk space
Mac Book Air 10.7.5
MacBook Air, Mac OS X (10.7.5)
About “Other”
https://support.apple.com/en-us/HT202867
Go step by step and check.
1. Start up in Safe Mode.
http://support.apple.com/kb/PH11212
2. Backup your computer.
3. Empty Trash.
Finder
Click on an empty spot on the Desktop to activate Finder.
Click “Empty Trash” to empty Trash.
Click Mailbox in the in the Mail menu bar.
Erase Deleted Items > In All Accounts
Erase Junk Mail
Photos
File > Recently Deleted > Click the “Delete All” button at the top right corner
iPhoto
iPhoto > Empty iPhoto Trash
https://support.apple.com/kb/PH13806?locale=en_US
4. Disk space / Time Machine / Local Snapshots
Local backups
http://support.apple.com/kb/ht4878
5. Delete old iOS Devices Backup.
iTunes > Preferences > Devices
Highlight the old Backups , press “Delete Backup” and then “OK”.
http://support.apple.com/kb/HT4946?viewlocale=en_US&locale=en_US
6. Re-index Macintosh HD.
This will take a while. Wait until it is finished.
System Preferences > Spotlight > Privacy