Import without versions should not override the previous history but only add a version

                if (!this.backupPack) {
                    // if the import is not a backup pack with set the user to the importing user
                    doc.getDoc().setAuthor(context.getUser());
                    doc.getDoc().setContentAuthor(context.getUser());
                    // if the import is not a backup pack we set the date to now
                    Date date = new Date();
                    doc.getDoc().setDate(date);
                    doc.getDoc().setContentUpdateDate(date);
                }

                if ((!this.preserveVersion) && (!this.withVersions)) {
                    doc.getDoc().setVersion("1.1");
                }

                // We don't want date and version to change
                // So we need to cancel the dirty status
                doc.getDoc().setContentDirty(false);
                doc.getDoc().setMetaDataDirty(false);
                for (XWikiAttachment xa : doc.getDoc().getAttachmentList()) {
                    xa.setMetaDataDirty(false);
                    xa.getAttachment_content().setContentDirty(false);
                }

                context.getWiki().saveDocument(doc.getDoc(), context);
                doc.getDoc().saveAllAttachments(false, true, context);
                addToInstalled(doc.getFullName() + ":" + doc.getLanguage(), context);

                if (this.withVersions) {
                    // we need to force the saving the document archive.
                    if (doc.getDoc().getDocumentArchive() != null) {
                        context.getWiki().getVersioningStore().saveXWikiDocArchive(
                            doc.getDoc().getDocumentArchive(context), true, context);
                    }
                }
                // if there is no archive in xml and content&metaData Dirty is not set
                // then archive was not saved
                // so we need save it via resetArchive
                if ((doc.getDoc().getDocumentArchive() == null)
                    || (doc.getDoc().getDocumentArchive().getNodes() == null) || (!this.withVersions)) {
                    doc.getDoc().resetArchive(context);
                }