The others have all said it really, but would just like to repeat Hiraeths very sound advice.
Make sure all your census images, BMD references, attached photos and docs are saved to your pc as they don't come with the GEDCOM... dates do but the link-destinations don't.
If you have a large tree and all your census info is only saved to Ancestry trees then it will take ages to go back and recover.... Ancestry appear to forget to tell you that bit up front for a very good reason.
Known many to have come a cropper to this one and its enough to put you off family history if you have to do it all over again... well almost
