Does this mean if i I get superduper and do a backup, it would be easier to replace the drive?
i've ordered the 8gb of RAM -- going to try that first and see if that speeds things up. Looking into the hard drive next.
Thanks!
Yes, that would be easier. What you will need to do is the following (assuming you do not need anything "old" from your Time Machine backups):
1. Purchase and install SuperDuper! on your internal drive. This link discusses that excellent program:
http://www.shirt-pocket.com/SuperDuper/SuperDuperDescription.html
2. Clean off as much unneeded stuff from your internal hard drive. A tool that you can use to augment that is Onyx, an excellent free program. You can get it from here:
http://www.titanium.free.fr/onyx.html
Given that you are using El Capitan, you must get the first version on that list, V 3.1.6.
3. Make sure you have the file "Install OS X El Capitan" on your internal drive. In fact, make a copy of it, and place it in another location on your internal drive.
4. Run Disk Utility and Erase and Format your current external drive. Note that this will erase all your Time Machine backups.
5. Run SuperDuper! to backup/clone everything on your internal drive onto the external drive. This will make a bootable backup.
6. Shut down your machine, remove the old internal drive, and install the new HDD/SSD.
7. Restart your machine from the SuperDuper!, bootable backup/clone you made in step 5 above.
8. Launch Disk Utility from the backup, and Erase and Format your new HDD/SSD inside your Mac.
9. Launch the file "Install OS X El Capitan" from the backup, and install a fresh, pristine, "virgin" version on El Capitan on your new internal HDD/SDD. At the end of that installation, the SetUp Assistant software will automatically start to run. You can answer the first two question it poses, and skip the third one. You will then be offered the opportunity to "migrate"/copy all the needed "stuff" from the SuperSuper! backup to the internal drive on your Mac. Select that, an dlet it complete.
10. Restart your Mac from the new internal HDD/SDD,and you'll be in business.
This process will 1) create the (hidden) Recovery HD partition for you, and 2) transfer all your settings/preferences, etc. from your "old" environment (ie, what was on your old internal drive).
The final decision left for you is what you want to do with your old, 250 gig internal drive. If I were you, I'd purchase an external case, and install it inside there.